The hardest thing in the test is two half 10m circles in trot. The rest is all nice and simple, 20m circles in middle of the school, walk a few steps trot, diagonal free walk on a long rein. You can get the test on dressage diagrams. My Mum is doing this on Badger the Fjord next Saturday!
Agree, the half circles at trot a bit tricky for a young, unbalanced horse. There's not much else to it - but there are a few transitions that might catch you out like they did me (trot, walk three steps then back to trot - I keep forgetting that one for some reason and just carry on in trot....)